getHours（）在React - Native中给出了错误的值

Question

我有以下Javascript代码来获取小时并显示它是否是早晨，晚上等。但是getHours（）总是给我一个错误的值。如果我在浏览器中使用它的正确但反应原生它总是一个错误的值。这段代码中的任何错误？

    let date = new Date();
    let day = date.getDate();
    let month = allMonths[date.getMonth()];
    let year = date.getFullYear();
    let hour = date.getHours();
    let minute = date.getMinutes();
    let greeting = '';
    if(day < 10){
        day = '0'+day;
    }

    if(hour < 12 ){
        greeting = 'Morning!';
    }else if(hour < 13 && hour >= 12){
        greeting = 'Afternoon!';
    }else if(hour < 18 && hour >= 13){
        greeting = 'Evening!';
    }else {
        greeting = 'Night!';
    }